Most wall mounts attach to your wall, causing your flat screen TV to protrude in ways you may not like. Mounts that invade your wall to mount the TV more attractively (like this one) are a bit more expensive. Apartment Therapy Tech notes that you can achieve the same effect with a standard mount by simply using a blocking board:

For those DIYers looking to save a few bucks (not that $100 isn't totally reasonable), you could also achieve the same look by mounting a blocking board in a wall cutout and using a cheaper standard mount. Either way, it's a clean, flush look that's fairly easy and inexpensive to accomplish.

If you want that perfect mount but also want to save some money, this looks like a good approach.